scholarly journals Enhancement of voltage stability in an interconnected network using unified power flow controller

2021 ◽  
Vol 4 (1) ◽  
pp. 65-74
Author(s):  
Idris A. Araga ◽  
A. E. Airoboman
Keyword(s):  
Power Flow ◽  
Large Scale ◽  
Voltage Stability ◽  
System Analysis ◽  
Optimal Placement ◽  
Unified Power Flow Controller ◽  
Stability Factor ◽  
Grid System ◽  
Power Injection ◽  
Bus Network

In this paper, the optimal placement of Unified Power Flow Controllers (UPFC) in a large-scale transmission network in order to improve the loadability margin was considered. In other to achieve this aim, the Line Stability Factor (LQP) as a technique for the optimal location of UPFC in the IEEE 14-bus network and 56-bus Nigerian national grid was adopted. The power injection model for the UPFC was employed to secure improvements in the loading margin of the IEEE 14-bus network and 56-bus Nigerian national grid system. Continuation power flow was used to assess the effect of UPFC on the loadability margin. Steady-state simulations using Power System Analysis Toolbox (PSAT) on MATLAB was applied to determine the effectiveness of placing UPFC between bus 13 and bus 14 in the IEEE 14-bus network and between bus 44 (Ikot-Ekpene) and bus 56 (Odukpani) in the 56-bus Nigerian national grid system. The results showed that the loadability margin increased by 8.52 % after UPFC was optimally placed in the IEEE 14-bus network and increased by 195.5 % after UPFC was optimally placed in the 56-bus Nigerian national grid system. Thus, these enhance the voltage stability of both network and utilizing the network efficiently.

Research on Power Flow Control of UPFC Based on PSASP/UPI

2013 ◽  
Vol 385-386 ◽  
pp. 1078-1081 ◽  
Author(s):  
Fang Zhang ◽  
Jian Ping Chen ◽  
Chuan Dong Li ◽  
Yan Juan Wu
Keyword(s):  
Power System ◽  
Flow Control ◽  
Power Flow ◽  
System Analysis ◽  
Unified Power Flow Controller ◽  
Power Flow Control ◽  
Engineering Research ◽  
Good Convergence ◽  
Practical Engineering ◽  
Bus Voltage

The main objective of power flow control for unified power flow controller (UPFC) is to increase the transmission capacity over the existing transmission corridor or line. This paper presents a practical engineering methodology of embedding the power flow control model of UPFC into the commercial software -- power system analysis software package (PSASP) based on its user program interface (UPI) function. In the proposed methodology, the interface currents of UPFC series side and UPFC shunt side between the UPFC device and the network are used to control the transmission line power flow and UPFC bus voltage, respectively. In UPFC series side, the current of UPFC series branch is calculated from the power target equation of the controlled line. In UPFC shunt side, the shunt reactive current of UPFC is used to control the bus voltage. Simulation results on a practical power system show that the proposed methodology can be efficiently applied to the engineering research and analysis of the real power grid with UPFC with good convergence and only one control parameter needed to be prescribed.

Multi-type facts placement for loss minimization using biogeography based optimization

2012 ◽  
Vol 61 (4) ◽  
pp. 517-531 ◽  
Author(s):  
A. Subramanian ◽  
G. Ravi
Keyword(s):  
Power Flow ◽  
Optimal Placement ◽  
Unified Power Flow Controller ◽  
Test Results ◽  
Voltage Profile ◽  
Facts Devices ◽  
New Strategy ◽  
Placement Type ◽  
Thyristor Controlled Series Compensator ◽  
Power Flow Controller

Abstract This paper presents a new strategy for optimal placement of multi-type FACTS devices with a view to minimize losses besides enhancing the voltage profile using biogeography based optimization. The strategy places three types of FACTS devices that include static VAR compensator, thyristor controlled series compensator and unified power flow controller; and offers optimal locations for placement, type and parameters of the FACTS devices. Test results on IEEE 14, 30 and 57 bus systems reveal the superiority of the algorithm.

scholarly journals A Comparison of Generalized Unified Power Flow Controller and Load Tap Changing Transformer for Voltage Stability Enhancement in a Power System

2021 ◽  
pp. 21-33
Author(s):  
Adewale Obaro ◽  
Isaiah Adebayo
Keyword(s):  
Power System ◽  
Power Flow ◽  
Voltage Drop ◽  
Unified Power Flow Controller ◽  
Grid System ◽  
Power Losses ◽  
Continuous Increase ◽  
Flow Controller ◽  
Power Flow Controller ◽  
System Power

The continuous increase in power demand and huge power losses in modern power systems have been a growing concern to power utilities. Such phenomenon often results in epileptic power supply, power system instability, supply fluctuations and security problems in many parts of the globe. Identification of suitable places for the installation of reactive power compensators to minimize voltage drop and system power losses in a power system becomes imperative. In this paper, the Newton-Raphson iterative method was used for the power flow solution of the 28 bus Nigerian 330KV grid system. The Generalized Unified Power flow Controller (GUPFC) is installed at identified weak load buses of the Nigerian 28-bus power system to reduce the losses and voltage drop of the system. A comparative analysis of the GUPFC with Load Tap Changing Transformers (LTCT) is also performed. Result obtained shows that the GUPFC can largely (effectively) improve the system power stability and selectively balance the power flow of multi-lines power flows when placed at identified weak buses compared with LTCT.  Thus, GUPFC can be used to reduce overall power losses along transmission lines as well as improve stability overall reliability of the power grid system.

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